Previous electrophysiological work argues that predictability and semantic incongruity rapidly impact comprehension, as indicated by modulation of the N400 component between ~300 and 500 ms. An ongoing question is whether effects of predictability in fact reflect pre-activation in long-term memory as opposed to modulating the kind of integration processes triggered by incongruity. Using fMRI, we compared the impact of predictability and incongruity in adjective-noun phrases, in regions identified with lexical and phrasal localizer scans. We found that predictability impacted activity in left posterior middle temporal gyrus (pMTG), while incongruity impacted activity in left precentral gyrus. Together with parallel data from ERP, these data are consistent with the hypothesis that left pMTG activity is a key contributor to N400 effects of predictability and that the relevant mechanism is reduced activation of stored lexical representations. We tentatively suggest that the left precentral region may play a role in reanalysis when incongruity is encountered.

中文翻译：

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fMRI 证据表明左后颞叶皮层对 N400 可预测性的影响与一致性无关

之前的电生理学工作认为，可预测性和语义不一致会迅速影响理解，正如 N400 组件在 ~300 到 500 毫秒之间的调制所表明的那样。一个持续存在的问题是，可预测性的影响是否实际上反映了长期记忆中的预激活，而不是调节由不协调触发的整合过程。使用 fMRI，我们比较了形容词 - 名词短语的可预测性和不协调性的影响，在用词汇和短语定位器扫描识别的区域中。我们发现可预测性影响左颞中后回 (pMTG) 的活动，而不协调影响左中央前回的活动。与来自 ERP 的并行数据一起，这些数据与以下假设一致，即左 pMTG 活性是 N400 可预测性影响的关键因素，并且相关机制是减少存储的词汇表示的激活。我们初步建议，当遇到不一致时，左中央前区可能在重新分析中发挥作用。